The Gemora Nidda would seem to exclude from being a vesset any non physical changes to the body as it says in the Mishna Niddah 63a:
מתני' כל אשה שיש לה וסת דיה שעתה ואלו הן הוסתות מפהקת ומעטשת וחוששת בפי כריסה ובשפולי מעיה ושופעת וכמין צמרמורות אוחזין אותה וכן כיוצא בהן וכל שקבעה לה שלשה פעמים הרי זה וסת:
Any woman that has a fixed moment (discharging blood at the start of her period), only has to stop relations when the fixed moment occurs, e.g. her joints start making popping sounds or she burps , she starts sneezing irregularly, she has a feeling in her stomach or intestines, etc.
The Gemora calls these occurrences specifically: הכא בוסתות דגופא - fixed Bodily occurrences that indicate the coming of blood.
The only other veses is the Haflaga (interval) gap or the chodesh(monthly) time related veses as the Gemora indicates when mentioning the only other instance that veses has been mentioned earlier on in Niddah 2a:
תנינא חדא זימנא כל אשה שיש לה וסת דיה שעתה התם בוסתות דיומי.
The Shulchan Aruch Choshen Mishpot 255,9 and Rambam hil. Maaser sheni 6,6 and in other places paskens: דברי חלומות לא מעלין ולא מורידין - dreams can not be of any repercussions, yet the Gemora Nedorim says: אמר רב יוסף נידוהו בחלום צריך י' בני אדם להתיר לו - if he was excomunicated in a dream he needs to annul the excomunication in front of 10 people, which would indicate the dream counts for some things. So we must conclude that we worry about repercussions of dreams Lechumra (to be strict on him) but we do not heed repercussios of dreams Lekula (to be lenient). So a dream where the excommunicator redeems his ban does not count as the Gemora then says:אמר ליה רב אחא לרב אשי שמתיה ושרו ליה בחלמיה מאי אמר ליה כשם שאי אפשר לבר בלא תבןכך אי אפשר לחלום בלא דברים בטלים.
Conclusion:
1. So we see that we only take notice of a Dream Lechumra to be
mechayev the dreamer to separate from his wife for concern that she might
discharge blood.
2. However to Release her from a vesset Kavua which she already had e.g a discharge sequence: 30 day gap 3 times followed by a dream
preceeding a discharge 3 times in the sequence 30, 30, 31 days, then
the next month she should separate on day 30 even though she hasn't
had the dream yet. Therefore it seams one cannot rely on dreams to
make a new vesset Kavua (fixed) to break a vesset haguf or
vesset zman that already exists.